Telegraph-transmitting apparatus



T. F. FOLEY TELEGRAPH TRANSMITTING A PPARATUS Fil ed May 13, 1922 Elm M1362:

I j'hamqeFFoi/ y Patentecl Nov. 2 5, 1924;

, UNITED STATES.

PATENT ormcs.

HOMAS FRANCIS FOLEY, oF Bnoo-KI.Y ,..NEw YORK, ASSIGNOR To THE WESTERN UNIoN TELEGRAPH COMPANY, on NEW YORK, N. Y., A CORPORATION or NEW YORK. Y

TELEGRA H-TRANSMITTING APPARATUS.

Application filed May 13, 1922. Serial. No. 530,708. I

- T all whom it may concern:

. Be. itknown thatI, THOMAS F. FOLEY, a subject of the King of Great Britain, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and'useful Improvements in Telegraph- Transmitting Apparatus, of which the following is aspecification. This invention" relates :to automatic telegraph transmitters of the type controlled by a suitablyperforated tape.

In, the following description, I have aplied my invention to the well known eatstone transmitter, modified to be caable oftransmitting the cable-Morse code.

he prepared tape has three rows of holes orperforations, the upper'row to send dots,

the lower row tosend dashes and the center row to be engaged bythe star wheel for continuously drawing the tape through the transmitter. The two reciprocating pins which respectively enterthe upper and lower rows of holes control not only the character or polarity of the impulses sent into the cable, but also the duration of the impulses or marking time and the corresponding earthing of the cable. The 'maximum markingperiod at present obtainable from the standard cable transmitter is slightly more than of the unit impulse period assigned to a code character. The object of my invention is to provide means for increasing the marking period to any desired percentage of the full impulse J period. The means foraccomplishing this purpose may be embodied in the structure of the transmitting apparatus or it may be in the form of an attachment associated therewith. v The drawing illustrates a portion of a Wheatstone transmitter embodying my in- \.vention and showing also in diagram the local transmitting or sending-on relays'conw trolled by the transmitter.

at The contact mechanism of the Wheatstone transmitter will be recognizedby those familiar with telegraph apparatus. The main driving gear 2 is actuated by any of the usual driving and governing mechanism, 50 such as clockWork weight-driven motors or electric motors. The tape-feeding star wheel 3 is driven through the pinion 4 and the rocker 5 through the pinion 6. On the downward stroke of the resser-bar 7 the leverarms 8 and 9 are rocked downwardly permitting the dash contacts at 16 to close a circuit from the positive pole of the battery 20 through conductor 33, contacts 16 conductor 21, and energizing coil 0 of the dash relay 23, to'negative pole 24 of battery. The armature a of'relay 23 swings against its right-hand contact, thereby connecting the negative pole of cable battery 25 through conductor 26 to cable C. The armature will remain against its right-hand contact until it is swung over against its left-hand contact by the stronger pull of the biasing coil 6. For this purpose a circuit is constantly closed through the coils b of the dot relay 22 and the Fdash relay 23 from positive pole 20 through conductor 27 to negative pole 24, but which is normalthe short-circuit around the coils b so that they become energized and move the armatures against their left-hand contacts. The cam dog. 31 can be adjusted axially to any position with respect to the shaft 11 and clamped in any desired position by turning the thumb piece 32. In this manner the in- 'stant at which the contacts at 30 will be opened can be accurately determined and upon this depends the movement of the armatures from right-hand to left-hand con-' facts which determine themarking period. 1 I am thus able to-determine with absolute accuracy the. length of the marking period and the'corresponding' earthing or curbing of the cable. The marking may be made any desired percentage of the time of. the 1 unit code impulse up to Y The manner in which the dot relay will be energized if the pin 12 passes through a hole in the tape will be evident from" the above explanation of the operation of the dash pin and relay. In positions of the tape having neither dot or dash perforations, both pins will strike the" tape so that neither contacts 15 or" .16 are closedand the cable will remain grounded or earthed, or as it is termed, a zero impulse is sent to cable.

Icla1m:'-

i 1. An automatic telegraph transmitter, comprising automatic contact making mech anism having selecting means cooperating with a perforated message strip for determining the character of a transmitted cur- .rent impulse, transmitting relays having their energizing coils controlled by said selecting meansysald relays. havlng' biasing @0118 operating counter to sa1d energizm coils, and adjustable means actuated by sai mechanism to render said ,biasin colls effective after the lapse of any desired intercoils. i

val"from the operation of the energizing- 2. In an automatic telegraph transmitterof 'the Wheatstone ty e, the combination with a pair of contact evers carrying pins res ectively adapted to pass through e dot an dash perforations of a signal tape, a signalling circuit havin two branch s one of which includes the and'the other the dash signalhng relay said relays each havin a biasm coil opposing the actuating coil? said bias mg coils being ot signalling relay' normally short-circuited, and an auxiliary lever normally sprin'g'actuated to close contacts included in the circuit of said biasing coils, and a cam operating to move said aux lllary lever to opensald short circuit to permit the biasing coils to control the position 

